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  • Research Article
  • Open Access

On the Superstability of the Pexider Type Trigonometric Functional Equation

Journal of Inequalities and Applications20102010:897123

  • Received: 23 October 2009
  • Accepted: 3 January 2010
  • Published:


We will investigate the superstability of the (hyperbolic) trigonometric functional equation from the following functional equations: and , which can be considered the mixed functional equations of the sine function and cosine function, the hyperbolic sine function and hyperbolic cosine function, and the exponential functions, respectively.


  • Functional Equation
  • Exponential Function
  • Full Article
  • Sine Function
  • Cosine Function

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Authors’ Affiliations

Department of Mathematics, Kangnam University, Yongin, Gyeonggi, 446-702, South Korea